<template>
  <div id="app">
    <ul>
      <li v-for="(item,index) in arr" :key="index">
        <span>{{item}}</span>

        <button @click="delBtn(index)">删除</button>
      </li>
    </ul>
    <button @click="btn">生成</button>
  </div>
</template>

<script>
export default {
  data(){
    return{
      arr:[1 ,5, 3]

    }
  },
  methods:{
    btn(){
      let i = parseInt(Math.random()*20)
      this.arr.push(i)
    },
    delBtn(index){
      this.arr.splice(index,1)

    }
  }
};
       
</script>

<style>
</style>
